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Since that move, the bulb has run continuously on an uninterruptible power supply previously it had only been off the grid for short periods of time (e.g. Ripley's Believe It Or Not stated that the short delay would not mar the bulb's continuous burning record.

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An electrician was on hand to install the bulb into the new fire station's emergency generator.

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It was deprived of electricity for only 22 minutes during the transfer, which was made in a specially designed box and with full firetruck escort. In 1976, the fire department moved to Fire Station #6 with the bulb the bulb socket's cord was severed for fear that unscrewing the bulb could damage it. The pendant light at Fire Station #6 in which the bulb is installed. It is titled 'A Million Hours of Service'. Retired Deputy Fire Chief Tom Bramell wrote a history of the bulb. The article came to the attention of Charles Kuralt of the CBS-TV program On the Road with Charles Kuralt. Dunstan contacted the Guinness Book of World Records, Ripley's Believe It or Not, and General Electric, who all confirmed it as the longest-lasting bulb known in existence. After weeks of interviewing people who had lived in Livermore all their lives, he wrote 'Light Bulb May Be World's Oldest', published in the Tri-Valley Herald. Its unusual longevity was first noticed in 1972 by reporter Mike Dunstan.

When the fire department consolidated, it was moved again to a newly constructed City Hall that housed the unified department. It was originally hung in 1901 in a hose cart house on L Street, then moved to a garage in downtown Livermore used by the fire and police departments. Įvidence suggests that the bulb has hung in at least four locations.

That story has been supported by firefighter volunteers of that era. Bernal owned the Livermore Power and Water Company and donated the bulb to the fire station when he sold the company. According to Zylpha Bernal Beck, the bulb was donated to the Fire Department by her father, Dennis Bernal, in 1901. It was manufactured in Shelby, Ohio, by the Shelby Electric Company in the late 1890s many just like it still exist and can be found functioning. The hand-blown, carbon-filament common light bulb was invented by Adolphe Chaillet, a French engineer who filed a patent for this technology. The Centennial Light was originally a 30- watt (or 60-watt ) bulb, but is now very dim, emitting about the same light as a 4-watt nightlight.